German Kings and Holy Roman Emperors: 1 king

      King Alfonso X of Castile   1257; 1273  

Italian Presidents and Prime Ministers: 1 prime minister

      (prime minister) Alfonso La Marmora   1864-1866  

Nobel Prize Winners: 1 peace

      (peace) Alfonso García Robles   1982  

Notable Athletes: 1 soccer

      (soccer) Marcelo Díaz (a.k.a. Alfonso)   1986-  

Notable Explorers and Adventurers: 1 explorer

      Afonso de Albuquerque (a.k.a. Alfonso)   1453-1515  

Oscar Award Winners: 1 director

      (director) Alfonso Cuarón   2013   Gravity  

Saints: 3 blessed, 1 saint

      Blessed Alfonso de Baena   ?-1570  
      Blessed Alfonso Pacheco   ?-1583  
      Saint Alfonso Liguori   1696-1787  
      Blessed Alfonso Maria Fusco   1839-1910  

Spanish Kings and Queens: 13 kings

      King Alfonso VI the Valiant (Castile)   1072-1073  
      King Alfonso I the Warrior (Aragon)   1104-1134  
      King Alfonso VII the Emperor (Castile)   1126-1157  
      King Alfonso VIII the Noble (Castile)   1158-1214  
      King Alfonso II the Chaste (Aragon)   1164-1196  
      King Alfonso IX (Leon)   1188-1230  
      King Alfonso X the Wise (Castile)   1252-1284  
      King Alfonso III (Aragon)   1285-1291  
      King Alfonso XI the Just (Castile)   1312-1350  
      King Alfonso IV the Good (Aragon)   1327-1336  
      King Alfonso V the Magnanimous (Aragon)   1416-1458  
      King Alfonso XII   1874-1885  
      King Alfonso XIII   1885-1931